Adds `options.deDupeHistory` for `readline.createInterface(options)`. If
`options.deDupeHistory` is `true`, when a new input line being added to
the history list duplicates an older one, removes the older line from
the list. Defaults to `false`.
Many users would appreciate this option, as it is a common setting in
shells. This option certainly should not be default behavior, as it
would be problematic in applications such as the `repl`, which inherits
from the readline `Interface`.
Extends documentation to reflect this API addition.
Adds tests for when `options.deDupeHistory` is truthy, and when
`options.deDupeHistory` is falsey.
PR-URL: https://github.com/nodejs/node/pull/2982
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
5bda5faffd
